I was driving and i hit my brake peadal and the petal was real hard on 1999 Chevrolet Malibu

I was driving along and went to slow down i hit the brakes and it barely slowed down like the brake booster was shot. The brake booster holds vacume most of the time if booster goes bad it dont hold vacume and now the font calipers are stuck this all happend at the same time. I also took the calipers off and they compress back easily so i know the calipers are not sricking could this be mastercylder problem? Thanks Dan